Compilare: user.cpp: In function ‘int main()’: user.cpp:18:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!f[x][y]){ ^ user.cpp:18:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!f[x][y]){ ^ user.cpp:19:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++c[x]; ^ user.cpp:20:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(x!=y) ++c[y]; ^ user.cpp:21:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[x][y]=f[y][x]=1; ^ user.cpp:21:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[x][y]=f[y][x]=1; ^ user.cpp:21:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[x][y]=f[y][x]=1; ^ user.cpp:21:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[x][y]=f[y][x]=1; ^ user.cpp:34:22: warning: iteration 25u invokes undefined behavior [-Waggressive-loop-optimizations] s+=(dp[i][n-1]); ^ user.cpp:33:15: note: containing loop for(i=1; i<=26; ++i) ^ user.cpp:30:24: warning: iteration 25u invokes undefined behavior [-Waggressive-loop-optimizations] dp[j][i]%=M; ^ user.cpp:27:19: note: containing loop for(j=1; j<=26; ++j){ ^ user.cpp:29:36: warning: iteration 25u invokes undefined behavior [-Waggressive-loop-optimizations] dp[j][i]+=dp[k][i-1]*(1-f[j][k]); ^ user.cpp:28:23: note: containing loop for(k=1; k<=26; ++k) ^ user.cpp:25:25: warning: iteration 25u invokes undefined behavior [-Waggressive-loop-optimizations] dp[i][1]=26-c[i]; ^ user.cpp:24:15: note: containing loop for(i=1; i<=26; ++i) ^